Oh for heavens sake, stop trying to inch your way toward what is acceptable. I think from the answers to the whole discussion up to now, it's pretty much safe to say that nothing below "has at least half a humanoid body" is gonna fly in this particular game.
The best you can hope for is probably something like the Sphinx in the original CoC or a Centaur.
While of course everyone wants their particular kink represented in it, and as much as possible, of course, lines have been drawn. Once you get a yay or nay, accept it.
For example, myself: Yeah, I'm a bit dissatisfied that there seems to be a LOT of dick in this game, like, aside from the outright male NPCs/ companions there's traps and shemales and dickgirls and as far as I can remember right now, there's only two "all female" options, one of which you have to lock down your game path for and surrender your soul. Since I am one of those people who don't subscribe to the "The dick only makes it better" philosophy, yeah, not a fan.
Would it be nice if there were options to "undick" those characters? Sure. But that depends on if the author can see their character being okay with that under certain circumstances. And if they decline, it wouldn't really make me more popular with them if I started trying to get compromises in like "could you make it retractible?" or "could we use shrinking items to make it almost go away?"
No, my only real option is to, well, not interact with those characters unless necessary in my play. Or not play the game at all.
In the end, we're lucky they actually ask us for suggestions, so I think the least we can do is respect it when they shoot something down and not start to somehow try to crowbar something we'd like in.
Well, I said my 2 cents... Now wait and watch me do the thing I just spoke out against myself somewhere down the road.... It'S not easy being perverted...